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serenity/Userland/Utilities/icc.cpp
Nico Weber 3a5d20d82b icc: Add a --measure flag that prints color difference in profile 
If --measure is passed, icc prints the color pairs with the smallest
and largest perceptual difference between them.

Converting 254 * 254 * 254 * 4 = 65 Million colors from sRGB to LAB
and then computing 254 * 254 * 254 * 3 = 49 Million DeltaEs between
them takes a while. On my laptop, it takes 17s to run. So there's
a small progress display.
2023-04-30 05:57:20 +02:00

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/*
* Copyright (c) 2022-2023, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/String.h>
#include <AK/StringView.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DateTime.h>
#include <LibCore/File.h>
#include <LibCore/MappedFile.h>
#include <LibGfx/DeltaE.h>
#include <LibGfx/ICC/BinaryWriter.h>
#include <LibGfx/ICC/Profile.h>
#include <LibGfx/ICC/Tags.h>
#include <LibGfx/ICC/WellKnownProfiles.h>
#include <LibGfx/ImageFormats/ImageDecoder.h>
#include <LibVideo/Color/CodingIndependentCodePoints.h>
template<class T>
static ErrorOr<String> hyperlink(URL const& target, T const& label)
{
return String::formatted("\033]8;;{}\033\\{}\033]8;;\033\\", target, label);
}
template<class T>
static void out_optional(char const* label, Optional<T> const& optional)
{
out("{}: ", label);
if (optional.has_value())
outln("{}", *optional);
else
outln("(not set)");
}
static void out_curve(Gfx::ICC::CurveTagData const& curve, int indent_amount)
{
if (curve.values().is_empty()) {
outln("{: >{}}identity curve", "", indent_amount);
} else if (curve.values().size() == 1) {
outln("{: >{}}gamma: {}", "", indent_amount, FixedPoint<8, u16>::create_raw(curve.values()[0]));
} else {
// FIXME: Maybe print the actual points if -v is passed?
outln("{: >{}}curve with {} points", "", indent_amount, curve.values().size());
}
}
static void out_parametric_curve(Gfx::ICC::ParametricCurveTagData const& parametric_curve, int indent_amount)
{
switch (parametric_curve.function_type()) {
case Gfx::ICC::ParametricCurveTagData::FunctionType::Type0:
outln("{: >{}}Y = X**{}", "", indent_amount, parametric_curve.g());
break;
case Gfx::ICC::ParametricCurveTagData::FunctionType::Type1:
outln("{: >{}}Y = ({}*X + {})**{} if X >= -{}/{}", "", indent_amount,
parametric_curve.a(), parametric_curve.b(), parametric_curve.g(), parametric_curve.b(), parametric_curve.a());
outln("{: >{}}Y = 0 else", "", indent_amount);
break;
case Gfx::ICC::ParametricCurveTagData::FunctionType::Type2:
outln("{: >{}}Y = ({}*X + {})**{} + {} if X >= -{}/{}", "", indent_amount,
parametric_curve.a(), parametric_curve.b(), parametric_curve.g(), parametric_curve.c(), parametric_curve.b(), parametric_curve.a());
outln("{: >{}}Y = {} else", "", indent_amount, parametric_curve.c());
break;
case Gfx::ICC::ParametricCurveTagData::FunctionType::Type3:
outln("{: >{}}Y = ({}*X + {})**{} if X >= {}", "", indent_amount,
parametric_curve.a(), parametric_curve.b(), parametric_curve.g(), parametric_curve.d());
outln("{: >{}}Y = {}*X else", "", indent_amount, parametric_curve.c());
break;
case Gfx::ICC::ParametricCurveTagData::FunctionType::Type4:
outln("{: >{}}Y = ({}*X + {})**{} + {} if X >= {}", "", indent_amount,
parametric_curve.a(), parametric_curve.b(), parametric_curve.g(), parametric_curve.e(), parametric_curve.d());
outln("{: >{}}Y = {}*X + {} else", "", indent_amount, parametric_curve.c(), parametric_curve.f());
break;
}
}
static float curve_distance_u8(Gfx::ICC::TagData const& tag1, Gfx::ICC::TagData const& tag2)
{
VERIFY(tag1.type() == Gfx::ICC::CurveTagData::Type || tag1.type() == Gfx::ICC::ParametricCurveTagData::Type);
VERIFY(tag2.type() == Gfx::ICC::CurveTagData::Type || tag2.type() == Gfx::ICC::ParametricCurveTagData::Type);
float curve1_data[256];
if (tag1.type() == Gfx::ICC::CurveTagData::Type) {
auto& curve1 = static_cast<Gfx::ICC::CurveTagData const&>(tag1);
for (int i = 0; i < 256; ++i)
curve1_data[i] = curve1.evaluate(i / 255.f);
} else {
auto& parametric_curve1 = static_cast<Gfx::ICC::ParametricCurveTagData const&>(tag1);
for (int i = 0; i < 256; ++i)
curve1_data[i] = parametric_curve1.evaluate(i / 255.f);
}
float curve2_data[256];
if (tag2.type() == Gfx::ICC::CurveTagData::Type) {
auto& curve2 = static_cast<Gfx::ICC::CurveTagData const&>(tag2);
for (int i = 0; i < 256; ++i)
curve2_data[i] = curve2.evaluate(i / 255.f);
} else {
auto& parametric_curve2 = static_cast<Gfx::ICC::ParametricCurveTagData const&>(tag2);
for (int i = 0; i < 256; ++i)
curve2_data[i] = parametric_curve2.evaluate(i / 255.f);
}
float distance = 0;
for (int i = 0; i < 256; ++i)
distance += fabsf(curve1_data[i] - curve2_data[i]);
return distance;
}
static ErrorOr<void> out_curve_tag(Gfx::ICC::TagData const& tag, int indent_amount)
{
VERIFY(tag.type() == Gfx::ICC::CurveTagData::Type || tag.type() == Gfx::ICC::ParametricCurveTagData::Type);
if (tag.type() == Gfx::ICC::CurveTagData::Type)
out_curve(static_cast<Gfx::ICC::CurveTagData const&>(tag), indent_amount);
if (tag.type() == Gfx::ICC::ParametricCurveTagData::Type)
out_parametric_curve(static_cast<Gfx::ICC::ParametricCurveTagData const&>(tag), indent_amount);
auto sRGB_curve = TRY(Gfx::ICC::sRGB_curve());
// Some example values (for abs distance summed over the 256 values of an u8):
// In Compact-ICC-Profiles/profiles:
// AdobeCompat-v2.icc: 1.14 (this is a gamma 2.2 curve, so not really sRGB but close)
// AdobeCompat-v4.icc: 1.13
// AppleCompat-v2.icc: 11.94 (gamma 1.8 curve)
// DCI-P3-v4.icc: 8.29 (gamma 2.6 curve)
// DisplayP3-v2-magic.icc: 0.000912 (looks sRGB-ish)
// DisplayP3-v2-micro.icc: 0.010819
// DisplayP3-v4.icc: 0.001062 (yes, definitely sRGB)
// Rec2020-g24-v4.icc: 4.119216 (gamma 2.4 curve)
// Rec2020-v4.icc: 7.805417 (custom non-sRGB curve)
// Rec709-v4.icc: 7.783267 (same custom non-sRGB curve as Rec2020)
// sRGB-v2-magic.icc: 0.000912
// sRGB-v2-micro.icc: 0.010819
// sRGB-v2-nano.icc: 0.052516
// sRGB-v4.icc: 0.001062
// scRGB-v2.icc: 48.379859 (linear identity curve)
// Google sRGB IEC61966-2.1 (from a Pixel jpeg, parametric): 0
// Google sRGB IEC61966-2.1 (from a Pixel jpeg, LUT curve): 0.00096
// Apple 2015 Display P3 (from iPhone 7, parametric): 0.011427 (has the old, left intersection for switching from linear to exponent)
// HP sRGB: 0.00096
// color.org sRGB2014.icc: 0.00096
// color.org sRGB_ICC_v4_Appearance.icc, AToB1Tag, a curves: 0.441926 -- but this is not _really_ sRGB
// color.org sRGB_v4_ICC_preference.icc, AToB1Tag, a curves: 2.205453 -- not really sRGB either
// So `< 0.06` identifies sRGB in practice (for u8 values).
float u8_distance_to_sRGB = curve_distance_u8(*sRGB_curve, tag);
if (u8_distance_to_sRGB < 0.06f)
outln("{: >{}}Looks like sRGB's curve (distance {})", "", indent_amount, u8_distance_to_sRGB);
else
outln("{: >{}}Does not look like sRGB's curve (distance: {})", "", indent_amount, u8_distance_to_sRGB);
return {};
}
static ErrorOr<void> out_curves(Vector<Gfx::ICC::LutCurveType> const& curves)
{
for (auto const& curve : curves) {
VERIFY(curve->type() == Gfx::ICC::CurveTagData::Type || curve->type() == Gfx::ICC::ParametricCurveTagData::Type);
outln(" type {}, relative offset {}, size {}", curve->type(), curve->offset(), curve->size());
TRY(out_curve_tag(*curve, /*indent=*/12));
}
return {};
}
static ErrorOr<void> print_profile_measurement(Gfx::ICC::Profile const& profile)
{
auto lab_from_rgb = [&profile](u8 r, u8 g, u8 b) {
u8 rgb[3] = { r, g, b };
return profile.to_lab(rgb);
};
float largest = -1, smallest = 1000;
Color largest_color1, largest_color2, smallest_color1, smallest_color2;
for (u8 r = 0; r < 254; ++r) {
out("\r{}/254", r + 1);
fflush(stdout);
for (u8 g = 0; g < 254; ++g) {
for (u8 b = 0; b < 254; ++b) {
auto lab = TRY(lab_from_rgb(r, g, b));
u8 delta_r[] = { 1, 0, 0 };
u8 delta_g[] = { 0, 1, 0 };
u8 delta_b[] = { 0, 0, 1 };
for (unsigned i = 0; i < sizeof(delta_r); ++i) {
auto lab2 = TRY(lab_from_rgb(r + delta_r[i], g + delta_g[i], b + delta_b[i]));
float delta = Gfx::DeltaE(lab, lab2);
if (delta > largest) {
largest = delta;
largest_color1 = Color(r, g, b);
largest_color2 = Color(r + delta_r[i], g + delta_g[i], b + delta_b[i]);
}
if (delta < smallest) {
smallest = delta;
smallest_color1 = Color(r, g, b);
smallest_color2 = Color(r + delta_r[i], g + delta_g[i], b + delta_b[i]);
}
}
}
}
}
outln("\rlargest difference between neighboring colors: {}, between {} and {}", largest, largest_color1, largest_color2);
outln("smallest difference between neighboring colors: {}, between {} and {}", smallest, smallest_color1, smallest_color2);
return {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
Core::ArgsParser args_parser;
StringView path;
args_parser.add_positional_argument(path, "Path to ICC profile or to image containing ICC profile", "FILE", Core::ArgsParser::Required::No);
StringView name;
args_parser.add_option(name, "Name of a built-in profile, such as 'sRGB'", "name", 'n', "NAME");
StringView dump_out_path;
args_parser.add_option(dump_out_path, "Dump unmodified ICC profile bytes to this path", "dump-to", 0, "FILE");
StringView reencode_out_path;
args_parser.add_option(reencode_out_path, "Reencode ICC profile to this path", "reencode-to", 0, "FILE");
bool measure = false;
args_parser.add_option(measure, "For RGB ICC profiles, print perceptually smallest and largest color step", "measure", 0);
bool force_print = false;
args_parser.add_option(force_print, "Print profile even when writing ICC files", "print", 0);
args_parser.parse(arguments);
if (path.is_empty() && name.is_empty()) {
warnln("need either a path or a profile name");
return 1;
}
if (!path.is_empty() && !name.is_empty()) {
warnln("can't have both a path and a profile name");
return 1;
}
if (path.is_empty() && !dump_out_path.is_empty()) {
warnln("--dump-to only valid with path, not with profile name; use --reencode-to instead");
return 1;
}
ReadonlyBytes icc_bytes;
NonnullRefPtr<Gfx::ICC::Profile> profile = TRY([&]() -> ErrorOr<NonnullRefPtr<Gfx::ICC::Profile>> {
if (!name.is_empty()) {
if (name == "sRGB")
return Gfx::ICC::sRGB();
return Error::from_string_literal("unknown profile name");
}
auto file = TRY(Core::MappedFile::map(path));
auto decoder = Gfx::ImageDecoder::try_create_for_raw_bytes(file->bytes());
if (decoder) {
if (auto embedded_icc_bytes = TRY(decoder->icc_data()); embedded_icc_bytes.has_value()) {
icc_bytes = *embedded_icc_bytes;
} else {
outln("image contains no embedded ICC profile");
exit(1);
}
} else {
icc_bytes = file->bytes();
}
if (!dump_out_path.is_empty()) {
auto output_stream = TRY(Core::File::open(dump_out_path, Core::File::OpenMode::Write));
TRY(output_stream->write_until_depleted(icc_bytes));
}
return Gfx::ICC::Profile::try_load_from_externally_owned_memory(icc_bytes);
}());
if (!reencode_out_path.is_empty()) {
auto reencoded_bytes = TRY(Gfx::ICC::encode(profile));
auto output_stream = TRY(Core::File::open(reencode_out_path, Core::File::OpenMode::Write));
TRY(output_stream->write_until_depleted(reencoded_bytes));
}
if (measure) {
if (profile->data_color_space() != Gfx::ICC::ColorSpace::RGB) {
warnln("--measure only works for RGB ICC profiles");
return 1;
}
TRY(print_profile_measurement(*profile));
}
bool do_print = (dump_out_path.is_empty() && reencode_out_path.is_empty() && !measure) || force_print;
if (!do_print)
return 0;
outln(" size: {} bytes", profile->on_disk_size());
out_optional(" preferred CMM type", profile->preferred_cmm_type());
outln(" version: {}", profile->version());
outln(" device class: {}", Gfx::ICC::device_class_name(profile->device_class()));
outln(" data color space: {}", Gfx::ICC::data_color_space_name(profile->data_color_space()));
outln(" connection space: {}", Gfx::ICC::profile_connection_space_name(profile->connection_space()));
outln("creation date and time: {}", Core::DateTime::from_timestamp(profile->creation_timestamp()));
out_optional(" primary platform", profile->primary_platform().map([](auto platform) { return primary_platform_name(platform); }));
auto flags = profile->flags();
outln(" flags: 0x{:08x}", flags.bits());
outln(" - {}embedded in file", flags.is_embedded_in_file() ? "" : "not ");
outln(" - can{} be used independently of embedded color data", flags.can_be_used_independently_of_embedded_color_data() ? "" : "not");
if (auto unknown_icc_bits = flags.icc_bits() & ~Gfx::ICC::Flags::KnownBitsMask)
outln(" other unknown ICC bits: 0x{:04x}", unknown_icc_bits);
if (auto color_management_module_bits = flags.color_management_module_bits())
outln(" CMM bits: 0x{:04x}", color_management_module_bits);
out_optional(" device manufacturer", TRY(profile->device_manufacturer().map([](auto device_manufacturer) {
return hyperlink(device_manufacturer_url(device_manufacturer), device_manufacturer);
})));
out_optional(" device model", TRY(profile->device_model().map([](auto device_model) {
return hyperlink(device_model_url(device_model), device_model);
})));
auto device_attributes = profile->device_attributes();
outln(" device attributes: 0x{:016x}", device_attributes.bits());
outln(" media is:");
outln(" - {}",
device_attributes.media_reflectivity() == Gfx::ICC::DeviceAttributes::MediaReflectivity::Reflective ? "reflective" : "transparent");
outln(" - {}",
device_attributes.media_glossiness() == Gfx::ICC::DeviceAttributes::MediaGlossiness::Glossy ? "glossy" : "matte");
outln(" - {}",
device_attributes.media_polarity() == Gfx::ICC::DeviceAttributes::MediaPolarity::Positive ? "of positive polarity" : "of negative polarity");
outln(" - {}",
device_attributes.media_color() == Gfx::ICC::DeviceAttributes::MediaColor::Colored ? "colored" : "black and white");
VERIFY((flags.icc_bits() & ~Gfx::ICC::DeviceAttributes::KnownBitsMask) == 0);
if (auto vendor_bits = device_attributes.vendor_bits())
outln(" vendor bits: 0x{:08x}", vendor_bits);
outln(" rendering intent: {}", Gfx::ICC::rendering_intent_name(profile->rendering_intent()));
outln(" pcs illuminant: {}", profile->pcs_illuminant());
out_optional(" creator", profile->creator());
out_optional(" id", profile->id());
size_t profile_disk_size = icc_bytes.size();
if (profile_disk_size != profile->on_disk_size()) {
VERIFY(profile_disk_size > profile->on_disk_size());
outln("{} trailing bytes after profile data", profile_disk_size - profile->on_disk_size());
}
outln("");
outln("tags:");
HashMap<Gfx::ICC::TagData*, Gfx::ICC::TagSignature> tag_data_to_first_signature;
TRY(profile->try_for_each_tag([&tag_data_to_first_signature](auto tag_signature, auto tag_data) -> ErrorOr<void> {
if (auto name = tag_signature_spec_name(tag_signature); name.has_value())
out("{} ({}): ", *name, tag_signature);
else
out("Unknown tag ({}): ", tag_signature);
outln("type {}, offset {}, size {}", tag_data->type(), tag_data->offset(), tag_data->size());
// Print tag data only the first time it's seen.
// (Different sigatures can refer to the same data.)
auto it = tag_data_to_first_signature.find(tag_data);
if (it != tag_data_to_first_signature.end()) {
outln(" (see {} above)", it->value);
return {};
}
tag_data_to_first_signature.set(tag_data, tag_signature);
if (tag_data->type() == Gfx::ICC::ChromaticityTagData::Type) {
auto& chromaticity = static_cast<Gfx::ICC::ChromaticityTagData&>(*tag_data);
outln(" phosphor or colorant type: {}", Gfx::ICC::ChromaticityTagData::phosphor_or_colorant_type_name(chromaticity.phosphor_or_colorant_type()));
for (auto const& xy : chromaticity.xy_coordinates())
outln(" x, y: {}, {}", xy.x, xy.y);
} else if (tag_data->type() == Gfx::ICC::CicpTagData::Type) {
auto& cicp = static_cast<Gfx::ICC::CicpTagData&>(*tag_data);
outln(" color primaries: {} - {}", cicp.color_primaries(),
Video::color_primaries_to_string((Video::ColorPrimaries)cicp.color_primaries()));
outln(" transfer characteristics: {} - {}", cicp.transfer_characteristics(),
Video::transfer_characteristics_to_string((Video::TransferCharacteristics)cicp.transfer_characteristics()));
outln(" matrix coefficients: {} - {}", cicp.matrix_coefficients(),
Video::matrix_coefficients_to_string((Video::MatrixCoefficients)cicp.matrix_coefficients()));
outln(" video full range flag: {} - {}", cicp.video_full_range_flag(),
Video::video_full_range_flag_to_string((Video::VideoFullRangeFlag)cicp.video_full_range_flag()));
} else if (tag_data->type() == Gfx::ICC::CurveTagData::Type) {
TRY(out_curve_tag(*tag_data, /*indent=*/4));
} else if (tag_data->type() == Gfx::ICC::Lut16TagData::Type) {
auto& lut16 = static_cast<Gfx::ICC::Lut16TagData&>(*tag_data);
outln(" input table: {} channels x {} entries", lut16.number_of_input_channels(), lut16.number_of_input_table_entries());
outln(" output table: {} channels x {} entries", lut16.number_of_output_channels(), lut16.number_of_output_table_entries());
outln(" color lookup table: {} grid points, {} total entries", lut16.number_of_clut_grid_points(), lut16.clut_values().size());
auto const& e = lut16.e_matrix();
outln(" e = [ {}, {}, {},", e[0], e[1], e[2]);
outln(" {}, {}, {},", e[3], e[4], e[5]);
outln(" {}, {}, {} ]", e[6], e[7], e[8]);
} else if (tag_data->type() == Gfx::ICC::Lut8TagData::Type) {
auto& lut8 = static_cast<Gfx::ICC::Lut8TagData&>(*tag_data);
outln(" input table: {} channels x {} entries", lut8.number_of_input_channels(), lut8.number_of_input_table_entries());
outln(" output table: {} channels x {} entries", lut8.number_of_output_channels(), lut8.number_of_output_table_entries());
outln(" color lookup table: {} grid points, {} total entries", lut8.number_of_clut_grid_points(), lut8.clut_values().size());
auto const& e = lut8.e_matrix();
outln(" e = [ {}, {}, {},", e[0], e[1], e[2]);
outln(" {}, {}, {},", e[3], e[4], e[5]);
outln(" {}, {}, {} ]", e[6], e[7], e[8]);
} else if (tag_data->type() == Gfx::ICC::LutAToBTagData::Type) {
auto& a_to_b = static_cast<Gfx::ICC::LutAToBTagData&>(*tag_data);
outln(" {} input channels, {} output channels", a_to_b.number_of_input_channels(), a_to_b.number_of_output_channels());
if (auto const& optional_a_curves = a_to_b.a_curves(); optional_a_curves.has_value()) {
outln(" a curves: {} curves", optional_a_curves->size());
TRY(out_curves(optional_a_curves.value()));
} else {
outln(" a curves: (not set)");
}
if (auto const& optional_clut = a_to_b.clut(); optional_clut.has_value()) {
auto const& clut = optional_clut.value();
outln(" color lookup table: {} grid points, {}",
TRY(String::join(" x "sv, clut.number_of_grid_points_in_dimension)),
TRY(clut.values.visit(
[](Vector<u8> const& v) { return String::formatted("{} u8 entries", v.size()); },
[](Vector<u16> const& v) { return String::formatted("{} u16 entries", v.size()); })));
} else {
outln(" color lookup table: (not set)");
}
if (auto const& optional_m_curves = a_to_b.m_curves(); optional_m_curves.has_value()) {
outln(" m curves: {} curves", optional_m_curves->size());
TRY(out_curves(optional_m_curves.value()));
} else {
outln(" m curves: (not set)");
}
if (auto const& optional_e = a_to_b.e_matrix(); optional_e.has_value()) {
auto const& e = optional_e.value();
outln(" e = [ {}, {}, {}, {},", e[0], e[1], e[2], e[9]);
outln(" {}, {}, {}, {},", e[3], e[4], e[5], e[10]);
outln(" {}, {}, {}, {} ]", e[6], e[7], e[8], e[11]);
} else {
outln(" e = (not set)");
}
outln(" b curves: {} curves", a_to_b.b_curves().size());
TRY(out_curves(a_to_b.b_curves()));
} else if (tag_data->type() == Gfx::ICC::LutBToATagData::Type) {
auto& b_to_a = static_cast<Gfx::ICC::LutBToATagData&>(*tag_data);
outln(" {} input channels, {} output channels", b_to_a.number_of_input_channels(), b_to_a.number_of_output_channels());
outln(" b curves: {} curves", b_to_a.b_curves().size());
TRY(out_curves(b_to_a.b_curves()));
if (auto const& optional_e = b_to_a.e_matrix(); optional_e.has_value()) {
auto const& e = optional_e.value();
outln(" e = [ {}, {}, {}, {},", e[0], e[1], e[2], e[9]);
outln(" {}, {}, {}, {},", e[3], e[4], e[5], e[10]);
outln(" {}, {}, {}, {} ]", e[6], e[7], e[8], e[11]);
} else {
outln(" e = (not set)");
}
if (auto const& optional_m_curves = b_to_a.m_curves(); optional_m_curves.has_value()) {
outln(" m curves: {} curves", optional_m_curves->size());
TRY(out_curves(optional_m_curves.value()));
} else {
outln(" m curves: (not set)");
}
if (auto const& optional_clut = b_to_a.clut(); optional_clut.has_value()) {
auto const& clut = optional_clut.value();
outln(" color lookup table: {} grid points, {}",
TRY(String::join(" x "sv, clut.number_of_grid_points_in_dimension)),
TRY(clut.values.visit(
[](Vector<u8> const& v) { return String::formatted("{} u8 entries", v.size()); },
[](Vector<u16> const& v) { return String::formatted("{} u16 entries", v.size()); })));
} else {
outln(" color lookup table: (not set)");
}
if (auto const& optional_a_curves = b_to_a.a_curves(); optional_a_curves.has_value()) {
outln(" a curves: {} curves", optional_a_curves->size());
TRY(out_curves(optional_a_curves.value()));
} else {
outln(" a curves: (not set)");
}
} else if (tag_data->type() == Gfx::ICC::MeasurementTagData::Type) {
auto& measurement = static_cast<Gfx::ICC::MeasurementTagData&>(*tag_data);
outln(" standard observer: {}", Gfx::ICC::MeasurementTagData::standard_observer_name(measurement.standard_observer()));
outln(" tristimulus value for measurement backing: {}", measurement.tristimulus_value_for_measurement_backing());
outln(" measurement geometry: {}", Gfx::ICC::MeasurementTagData::measurement_geometry_name(measurement.measurement_geometry()));
outln(" measurement flare: {} %", measurement.measurement_flare() * 100);
outln(" standard illuminant: {}", Gfx::ICC::MeasurementTagData::standard_illuminant_name(measurement.standard_illuminant()));
} else if (tag_data->type() == Gfx::ICC::MultiLocalizedUnicodeTagData::Type) {
auto& multi_localized_unicode = static_cast<Gfx::ICC::MultiLocalizedUnicodeTagData&>(*tag_data);
for (auto& record : multi_localized_unicode.records()) {
outln(" {:c}{:c}/{:c}{:c}: \"{}\"",
record.iso_639_1_language_code >> 8, record.iso_639_1_language_code & 0xff,
record.iso_3166_1_country_code >> 8, record.iso_3166_1_country_code & 0xff,
record.text);
}
} else if (tag_data->type() == Gfx::ICC::NamedColor2TagData::Type) {
auto& named_colors = static_cast<Gfx::ICC::NamedColor2TagData&>(*tag_data);
outln(" vendor specific flag: 0x{:08x}", named_colors.vendor_specific_flag());
outln(" common name prefix: \"{}\"", named_colors.prefix());
outln(" common name suffix: \"{}\"", named_colors.suffix());
outln(" {} colors:", named_colors.size());
for (size_t i = 0; i < min(named_colors.size(), 5u); ++i) {
const auto& pcs = named_colors.pcs_coordinates(i);
// FIXME: Display decoded values? (See ICC v4 6.3.4.2 and 10.8.)
out(" \"{}\", PCS coordinates: 0x{:04x} 0x{:04x} 0x{:04x}", TRY(named_colors.color_name(i)), pcs.xyz.x, pcs.xyz.y, pcs.xyz.z);
if (auto number_of_device_coordinates = named_colors.number_of_device_coordinates(); number_of_device_coordinates > 0) {
out(", device coordinates:");
for (size_t j = 0; j < number_of_device_coordinates; ++j)
out(" 0x{:04x}", named_colors.device_coordinates(i)[j]);
}
outln();
}
if (named_colors.size() > 5u)
outln(" ...");
} else if (tag_data->type() == Gfx::ICC::ParametricCurveTagData::Type) {
TRY(out_curve_tag(*tag_data, /*indent=*/4));
} else if (tag_data->type() == Gfx::ICC::S15Fixed16ArrayTagData::Type) {
// This tag can contain arbitrarily many fixed-point numbers, but in practice it's
// exclusively used for the 'chad' tag, where it always contains 9 values that
// represent a 3x3 matrix. So print the values in groups of 3.
auto& fixed_array = static_cast<Gfx::ICC::S15Fixed16ArrayTagData&>(*tag_data);
out(" [");
int i = 0;
for (auto value : fixed_array.values()) {
if (i > 0) {
out(",");
if (i % 3 == 0) {
outln();
out(" ");
}
}
out(" {}", value);
i++;
}
outln(" ]");
} else if (tag_data->type() == Gfx::ICC::SignatureTagData::Type) {
auto& signature = static_cast<Gfx::ICC::SignatureTagData&>(*tag_data);
if (auto name = signature.name_for_tag(tag_signature); name.has_value()) {
outln(" signature: {}", name.value());
} else {
outln(" signature: Unknown ('{:c}{:c}{:c}{:c}' / 0x{:08x})",
signature.signature() >> 24, (signature.signature() >> 16) & 0xff, (signature.signature() >> 8) & 0xff, signature.signature() & 0xff,
signature.signature());
}
} else if (tag_data->type() == Gfx::ICC::TextDescriptionTagData::Type) {
auto& text_description = static_cast<Gfx::ICC::TextDescriptionTagData&>(*tag_data);
outln(" ascii: \"{}\"", text_description.ascii_description());
out_optional(" unicode", TRY(text_description.unicode_description().map([](auto description) { return String::formatted("\"{}\"", description); })));
outln(" unicode language code: 0x{}", text_description.unicode_language_code());
out_optional(" macintosh", TRY(text_description.macintosh_description().map([](auto description) { return String::formatted("\"{}\"", description); })));
} else if (tag_data->type() == Gfx::ICC::TextTagData::Type) {
outln(" text: \"{}\"", static_cast<Gfx::ICC::TextTagData&>(*tag_data).text());
} else if (tag_data->type() == Gfx::ICC::ViewingConditionsTagData::Type) {
auto& viewing_conditions = static_cast<Gfx::ICC::ViewingConditionsTagData&>(*tag_data);
outln(" unnormalized CIEXYZ values for illuminant (in which Y is in cd/m²): {}", viewing_conditions.unnormalized_ciexyz_values_for_illuminant());
outln(" unnormalized CIEXYZ values for surround (in which Y is in cd/m²): {}", viewing_conditions.unnormalized_ciexyz_values_for_surround());
outln(" illuminant type: {}", Gfx::ICC::MeasurementTagData::standard_illuminant_name(viewing_conditions.illuminant_type()));
} else if (tag_data->type() == Gfx::ICC::XYZTagData::Type) {
for (auto& xyz : static_cast<Gfx::ICC::XYZTagData&>(*tag_data).xyzs())
outln(" {}", xyz);
}
return {};
}));
return 0;
}
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